memory leak 32bytes/bind

hello,
I port openldap 2-1-12 to vxworks, and make a simple test and find
memory leak every time when I calling
ldap_init , ldap_bind_s ,ldap_unbind.
each time memory leak 32 bytes, but if I call
ldap_init, ldap_unbind
no memory leaks .
who has experience about it pleas help me.